Polygonum achoreum S. F. Blake
Common Name: SMARTWEED
Coefficient of Conservatism: 0
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt A-Forb

Polygonum achoreum R. W. Smith

Sandy and gravelly roadsides and clearings, railroads. A plant of unknown nativity now a weed across northern North America, but not collected until 1919 (Gogebic Co.) and likely not native here.

The prominent beak on the fruiting perianth, relatively short perianth lobes, and more rounded leaf tips make this species relatively distinctive in the group.


Alcona County
Alger County
Alpena County
Baraga County
Berrien County
Cheboygan County
Chippewa County
    Including Drummond Island
Clinton County
Dickinson County
Eaton County
Emmet County
Gogebic County
Houghton County
Ingham County
Ionia County
Iron County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Only on Isle Royale
Lenawee County
Marquette County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Ontonagon County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Schoolcraft County
Shiawassee County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 7, 2022. https://michiganflora.net/species.aspx?id=2294.